Low-impedance RF system with a new type of feedback amplifier for a high-intensity synchrotron under heavy beam loading
✍ Scribed by Toshiyuki Oki; Yoshiro Irie; Susumu Takano
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 511 KB
- Volume
- 565
- Category
- Article
- ISSN
- 0168-9002
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✦ Synopsis
In the ISIS facility at Rutherford Appleton Laboratory (RAL) in the UK, a second target station project is in progress. Four 2ndharmonic RF cavities were installed in the ISIS synchrotron to increase the trapping efficiency, and to mitigate the space charge detuning, allowing a 50% increase in the accelerated beam intensity. A very low-impedance RF system for the 2nd-harmonic cavity was developed by a collaboration of Argonne National Laboratory (US), KEK (Japan) and RAL. The system consists of a 240 kW triode as a finalamplifier with plate-to-grid feedback. The measured output-impedance is less than 30 O over a frequency range of 2.6-6.2 MHz. Highpower tests were performed using a swept-frequency at 50 Hz repetition rate. The operation was stable, and a 6.2 kV peak per gap was obtained. The voltage gain of the final-amplifier is 25-30, which gradually decreases with the frequency. A test with beam is planned at ISIS in the near future.